package com.nq.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

import javax.websocket.HandshakeResponse;
import javax.websocket.server.HandshakeRequest;
import javax.websocket.server.ServerEndpointConfig;
import java.util.List;

@Configuration
public class WebSocketConfig extends ServerEndpointConfig.Configurator{
    /**
     * 	注入ServerEndpointExporter，
     * 	这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint
     */
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }

    @Override
    public void modifyHandshake(ServerEndpointConfig sec, HandshakeRequest request, HandshakeResponse response) {
        List<String> list = request.getHeaders().get("Sec-WebSocket-Protocol");
        if (list != null && list.size() > 0) {
            response.getHeaders().put("Sec-WebSocket-Protocol", list);
            super.modifyHandshake(sec, request, response);
        }
    }

}
